iPhone 4 Missed SMS and Call reminders.

Hello,
I'm coming from Blackberry and Motorola cell phones and just picked up the iPhone 4. How can I make it so that missed (unread) SMS txt and Calls beep every X (configurable) number of minutes until I respond? I am away from my phone for several hours sometimes and when I am near it again I don't want to have to check to see if anything happened.

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